What is a CAC used for?

A Common Access Card (CAC) is primarily used as a smart card for individuals in the United States Department of Defense (DoD) and associated personnel. Its main function is to provide secure access to various systems and facilities. This includes physical access to buildings and secure environments as well as digital access to DoD networks and systems. The CAC serves as a critical tool for identity verification, enabling personnel to authenticate themselves before they can access sensitive information and resources, which is vital in maintaining security protocols within the defense sector.